:root { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color-scheme: light dark; --bg: #f8fafc; --fg: #172033; --muted: #586579; --edge: #dce2ea; --accent: #2259c4; --panel: #eef2f7; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); }
main { max-width: 680px; margin: auto; padding: 48px 24px; }
.brand { font-size: 27px; font-weight: 750; letter-spacing: -.04em; margin-bottom: 64px; }
.brand span { font-size: 15px; font-weight: 450; color: var(--muted); letter-spacing: 0; }
.eyebrow { color: var(--muted); font-size: 14px; }
h1 { font-size: clamp(28px, 5vw, 40px); letter-spacing: -.03em; line-height: 1.25; margin: 16px 0; }
p, li { line-height: 1.8; }
.intro { font-size: 17px; color: var(--muted); margin-bottom: 28px; }
button { min-height: 48px; border: 0; border-radius: 12px; padding: 12px 24px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:disabled { background: var(--edge); color: var(--muted); cursor: default; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
.status { color: var(--muted); font-size: 14px; min-height: 50px; margin-top: 12px; }
ol { padding-left: 24px; margin: 20px 0 32px; }
li { padding: 4px 0 4px 6px; }
aside { background: var(--panel); border: 1px solid var(--edge); border-radius: 16px; padding: 20px; }
h2 { font-size: 16px; margin: 0 0 8px; }
aside p { margin: 0; font-size: 14px; color: var(--muted); }
footer { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; margin-top: 36px; font-size: 13px; color: var(--muted); }
a { color: var(--accent); text-underline-offset: 4px; }
@media (prefers-color-scheme: dark) { :root { --bg: #111722; --fg: #e8edf5; --muted: #a8b3c4; --edge: #344052; --accent: #7daaff; --panel: #1b2330; } button { color: #101b30; } }
@media (max-width: 400px) { main { padding: 32px 20px; } .brand { margin-bottom: 40px; } }